1. Genesis or Yes β BAND
2. Many a character in "The Grapes of Wrath" β OKIE
3. Barnyard sound β OINK
4. Prepare to be knighted β KNEEL
5. Epitome of simplicity β ABC
6. Genre for Genesis or Yes, informally β PROGROCK
7. Lead (the way) β PAVE
8. Glossy finishes β SHEENS
9. Active and enthusiastic sort β BUSYBEE
10. Approx. β EST
11. Easily found on the internet, say β GOOGLEABLE
12. Memo heading β INRE
13. Grammy-winning R&B artist whose stage name is said to have been inspired by "The Matrix" β NEYO
19. Golden Age studio known for many Astaire/Rogers films β RKO
21. You might heave a big one β SIGH
25. Places β AREAS
27. Mike in "Breaking Bad," for example β EXCOP
28. Cancel, as a space launch β ABORT
29. Procrastinator's mantra β LATER
30. What someone seeking validation might need β EGOMASSAGE
32. Shallow boat with a square stern β SKIFF
34. Neighbor of a Slovene β CROAT
35. "Take it easy!" β SEEYA
37. Brother to Groucho β CHICO
38. Mournful cries β WAILS
41. One in a box at the theater? β RAISINET
44. Tranquilizes β SEDATES
46. Penalty in Monopoly β RENT
48. Artist known for his "impossible staircases" β ESCHER
51. Symbol of divine authority in hieroglyphics β ASP
53. Grab control of β SEIZE
54. Words before a date β ASOF
55. Tentative greeting β UMHI
57. The Hawkeye State β IOWA
59. Show extreme fandom for, in slang β STAN
60. Give temporarily β LEND
61. Ryan and Adams of Hollywood β AMYS
63. Whistle blower or flag thrower β REF
64. Hosp. hot spots β ERS